Final answer:
The nurse should go to the room and assess the client's chest pain first, as chest pain in a client diagnosed with CAD is a potentially serious symptom that requires immediate assessment.
Step-by-step explanation:
The nurse should take option d, which is to go to the room and assess the client's chest pain first. Chest pain in a client diagnosed with CAD (coronary artery disease) is a potentially serious symptom that requires immediate assessment. The nurse needs to gather information about the pain, such as intensity, location, radiation, and associated symptoms, to determine the appropriate intervention.